Dental Anatomy | Working Movement | INBDE

TL;DR

This video explains the concept of working and non-working movement in dental anatomy and provides a step-by-step process to analyze occlusion in different planes of space.

Transcript

foreign this video is sponsored by bootcamp.com check it out for inbde prep and use coupon code mental Dental for 10 off hey everyone Dr Ryan here and welcome back to our Dental Anatomy series this video is dedicated to the topic of working and non-working movement now this is a topic that I hear about all the time in the comment section on YouTube... Read More

Key Insights

• 👁️ Understanding working and non-working movement in dental anatomy is crucial for dental students and professionals, as it will appear on exams and is a complex topic that requires visualization in three planes of space.
• 🌍 The maxilla and upper teeth are fixed and cannot move, while the mandible and lower teeth can move together as one unit.
• 🦷 The direction of mandibular movement determines which side is the working side and which side is the non-working or balancing side.
• 🤔 Teeth contact in a distinct way depending on whether it's a working side or balancing side contact. Working side contacts are more desirable and comfortable for patients.
• 🙌🏽 The Dr. Ryan hierarchy of occlusal contacts states that functioning cusps should always be in contact, followed by working side contacts, balancing side contacts, and no contact of non-functioning cusps.
• ⚖️ The condyles of the mandible play a significant role in the movement of the teeth, with the working side condyle rotating and the balancing side condyle sliding down the articular eminence.
• 🔀 In different movements (working, balancing, protrusive), teeth contacts occur in different areas, such as the facial groove, transverse groove of the oblique ridge, and central groove.
• 📊 Using a grid representation and color coding can help visualize and understand occlusal contacts and movement patterns for different teeth in the maxillary and mandibular arches.

Questions & Answers

Q: What is the difference between working and non-working movement in dental anatomy?

Working movement refers to the side of the mouth where the mandible is moving, while non-working movement refers to the opposite side. Working movement involves the teeth contacting and moving against each other, while non-working movement involves the teeth sliding against inclined surfaces.

Q: Why is visualizing occlusion in three planes of space important in understanding working and non-working movement?

Visualizing occlusion in three planes of space helps understand how the mandible and maxilla interact during different movements. It allows for a comprehensive understanding of how the teeth contact and move against each other in all directions.

Q: What are the key components of working movement in dental anatomy?

The key components of working movement are the contact between the lingual incline of the maxillary facial cusps and the facial incline of the mandibular buccal cusps, as well as the contact between the lingual incline of the maxillary lingual cusps and the facial incline of the mandibular lingual cusps.

Q: How does the direction of movement affect the side of the mouth that is considered the working side?

The side of the mouth that is considered the working side depends on the direction of movement. If the mandible is moving to the left, the left side is the working side, and if the mandible is moving to the right, the right side is the working side.

Q: What are the potential implications of balancing side contacts in dental occlusion?

Balancing side contacts can be more uncomfortable for the patient compared to working side contacts. Clinically, balancing side contacts are considered less desirable, and the goal is to achieve proper functioning cusp contacts, followed by working side contacts, and minimal balancing side contacts.

Q: How are the condyles of the mandible involved in working and non-working movement?

In working movement, the condyle on the working side pivots or rotates, while the condyle on the non-working or balancing side slides down the articular eminence. The nature of the mandible, being one bone with two joints, forces the condyles to work together during movement.

Q: What is the Dr. Ryan hierarchy of occlusal contacts?

The Dr. Ryan hierarchy of occlusal contacts refers to the order of priority in occlusal contacts. Functioning cusps should always be in contact, followed by working side contacts, balancing side contacts, and non-functioning cusps should never contact.

Q: What are some common sources of balancing side interference in dental occlusion?

The palatal cusps of maxillary second molars are often the most common source of balancing side interference in dental occlusion.

Summary & Key Takeaways

• The video explains the concept of working and non-working movement in dental anatomy and how the mandible and maxilla interact during different movements.

• It emphasizes the importance of visualizing occlusion in three planes of space and provides visual aids, such as images and diagrams, to aid understanding.

• The video breaks down the step-by-step process for analyzing occlusion and provides examples to illustrate the application of this process.